CN107445594B - Nano-aperture porous periclase-forsterite ceramic material and preparation method thereof - Google Patents
Nano-aperture porous periclase-forsterite ceramic material and preparation method thereof Download PDFInfo
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Abstract
A porous periclase-forsterite ceramic material with nanometer pore diameter and its preparation method are provided. The technical scheme is as follows: and heating the magnesite fine powder to 600-800 ℃ and 800-1200 ℃ in sequence, and respectively preserving heat to obtain the magnesium oxide powder with high porosity. According to the weight percentage of the high-porosity magnesium oxide powder, the weight percentage of the silica sol and the weight percentage of the silica micropowder are 65-95%, 0.1-18% and 0.1-22%, the high-porosity magnesium oxide powder is placed in a vacuum mixer, the silica sol and the silica micropowder are poured into the vacuum mixer under 2.0kPa and are mixed, and the mixture is obtained. Heating the mixture to 110-220 ℃, preserving heat, and performing mechanical pressing; drying; then, the temperature is respectively kept at 800-1200 ℃ and 1400-1600 ℃ to obtain the porous periclase-forsterite ceramic material with the nano pore diameter. The preparation cost is low, and the prepared porous periclase-forsterite ceramic material with the nano-aperture has the characteristics of nano-scale aperture, small volume density, low heat conductivity coefficient and high strength.
Description
Technical Field
The invention belongs to the technical field of porous periclase-forsterite ceramic materials. In particular to a porous periclase-forsterite ceramic material with nano-aperture and a preparation method thereof.
Background
With the rapid development of social economy, energy and resources are gradually consumed, and energy conservation and emission reduction become one of the hot spots of global attention. The porous ceramic has lower heat conductivity coefficient and volume density, is one of main varieties of heat-insulating refractory materials, plays a key role in energy conservation and consumption reduction of high-temperature industry, and is paid more and more attention by refractory material researchers. The periclase-forsterite material has excellent high-temperature mechanical property and good chemical stability, and is widely used for high-temperature kilns such as glass kilns, cement kilns and the like, so that the research on the porous periclase-forsterite ceramic material has practical significance for energy conservation and consumption reduction in high-temperature industry.
At present, a certain progress has been made on the research of porous periclase-forsterite ceramic materials, such as ' a periclase-olivine light heat-insulating refractory material and a production method thereof ' (CN 1704384A) ' patent technology, magnesite powder, light-burned magnesia powder and silica powder are used as raw materials, sawdust and coal powder are used as pore-forming agents, and the prepared light periclase-forsterite refractory material has the advantages, but has the defects that the pore diameter of pores of the product is larger, and CO is generated after the pore-forming agents are completely burned2Secondary pollution can be caused; in addition, the forsterite heat insulation material is prepared by taking forsterite sand, magnesite and magnesite as raw materials (Zheng run, Wang Jiandong. development of light forsterite bricks for glass kilns. 2012,49(2): 129-13 l) as a refractory material, but the technology has higher requirements on the raw materials, and the materials have larger pore diameter, extremely uneven pore diameter distribution and lower strength; for example, in the patent technology of "a porous forsterite-akermanite composite ceramic material and a preparation method thereof (CN 201410362125.9)", dolomite powder, silica powder and magnesite powder are used as raw materials to prepare the porous forsterite-akermanite ceramic material with higher strength, but the ceramic material has larger pore diameter of pores, lower refractoriness and lower strength.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and aims to provide a preparation method of a low-cost nano-aperture porous periclase-forsterite ceramic material, wherein the prepared nano-aperture porous periclase-forsterite ceramic material has the advantages of nano-scale aperture, small volume density, low thermal conductivity and high strength.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:
firstly, heating magnesite fine powder to 600-800 ℃ at the speed of 1-2 ℃/min, and preserving heat for 1-4 hours; and then heating to 800-1200 ℃ at the speed of 2-3 ℃/min, preserving the heat for 1-5 hours, and cooling to obtain the magnesium oxide powder with high porosity.
And secondly, according to the weight percentages of 65-95% of the high-porosity magnesium oxide powder, 0.1-18% of silica sol and 0.1-22% of silica micropowder, putting the high-porosity magnesium oxide powder into a vacuum stirrer, vacuumizing to below 2.0kPa, pouring the silica sol and the silica micropowder into the vacuum stirrer, stirring for 15-30 minutes, and closing a vacuumizing system to obtain a mixture.
Step three, heating the mixture to 110-220 ℃, preserving heat for 2-5 hours, cooling, and performing mechanical compression molding under the condition of 30-100 MPa; drying the molded blank at 110-150 ℃ for 12-36 hours; then heating to 800-1200 ℃ at the speed of 2-3 ℃/min, and preserving heat for 1-5 hours; and then heating to 1400-1600 ℃ at the speed of 3-5 ℃/min, preserving the heat for 3-8 hours, and cooling to obtain the porous periclase-forsterite ceramic material with the nano pore diameter.
The particle size of the magnesite fine powder is less than 0.088mm, and the MgO content of the magnesite fine powder is 42-50 wt%.
SiO of the silica sol2The content is 30-40 wt%.
The particle size of the silicon dioxide micro powder is less than 0.002m, and the SiO of the silicon dioxide micro powder2The content is more than 96 wt%.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
according to the method, the magnesite fine powder is decomposed in situ at 600-800 ℃ to generate nano-scale air holes, the formed magnesium oxide microcrystals are subjected to surface diffusion and evaporation-condensation substance transmission processes at 800-1200 ℃, certain neck links are generated among the magnesium oxide microcrystals, particle rearrangement in the middle and later sintering stages is limited, magnesium oxide powder with high porosity is obtained, and the magnesium oxide powder is used as a raw material to obtain the nano-aperture periclase-forsterite ceramic material with small volume density and low heat conductivity coefficient.
The invention introduces silica sol into magnesium oxide powder with high porosity, and leads SiO in the silica sol to be dissolved in vacuum2The magnesium oxide is enriched at the neck of the particle, and the forsterite neck is generated through in-situ reaction at high temperature, so that rearrangement of the magnesium oxide particle in the high-temperature sintering process is hindered.
According to the invention, the silicon dioxide micro powder is added into the magnesia powder with high porosity to fill the gaps among the magnesia powder, so that on one hand, pores among the magnesia powder are enabled to be nano-sized, the strength of the product is improved, and on the other hand, the nano-pore diameter porous periclase-forsterite ceramic material is connected with the forsterite neck formed by in-situ reaction of the magnesia to prevent rearrangement of magnesia particles in the high-temperature sintering process, thereby obtaining the nano-pore diameter porous periclase-forsterite ceramic material.
The detection shows that the porous periclase-forsterite ceramic material with the nano aperture prepared by the invention is as follows: the apparent porosity is 25-51%; the bulk density is 1.61-2.30 g/cm3(ii) a The average pore diameter is 500 nm-1500 nm; the compressive strength is 50-150 MPa; the phase composition is periclase and forsterite.
Therefore, the preparation cost of the invention is low, and the prepared nano-aperture porous periclase-forsterite ceramic material has the characteristics of nano-scale aperture, small volume density, low heat conductivity coefficient and high strength.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
In order to avoid repetition, the silica sol in this specific embodiment is described below in a unified manner, and is not described in detail in the embodiment:
the MgO content of the magnesite fine powder is 42-50 wt%.
SiO of the silica sol2The content is 30-40 wt%.
SiO of the fine silica powder2The content is more than 96 wt%.
Example 1
A porous periclase-forsterite ceramic material with nanometer pore diameter and its preparation method are provided. The preparation method of the embodiment comprises the following steps:
firstly, heating magnesite fine powder to 600-800 ℃ at the speed of 1-2 ℃/min, and preserving heat for 1-2 hours; and then heating to 800-1000 ℃ at the speed of 2-3 ℃/min, preserving the heat for 1-3 hours, and cooling to obtain the magnesium oxide powder with high porosity.
And secondly, placing the high-porosity magnesium oxide powder in a vacuum stirrer, vacuumizing to below 2.0kPa, pouring the silica sol and the silica micropowder into the vacuum stirrer, stirring for 15-30 minutes, and closing a vacuumizing system to obtain a mixture according to 65-75 wt% of the high-porosity magnesium oxide powder, 8-18 wt% of silica sol and 12-22 wt% of the silica micropowder.
Step three, heating the mixture to 110-220 ℃, preserving heat for 2-5 hours, cooling, and performing mechanical compression molding under the condition of 30-60 MPa; drying the molded blank at 110-150 ℃ for 12-24 hours; then heating to 800-1000 ℃ at the speed of 2-3 ℃/min, and preserving heat for 1-3 hours; and then heating to 1400-1500 ℃ at the speed of 4-5 ℃/min, preserving the heat for 3-5 hours, and cooling to obtain the nano-aperture porous periclase-forsterite ceramic material.
The particle size of the magnesite fine powder is less than 0.088 mm; the particle size of the silicon dioxide micro powder is less than 0.002 mm.
The nano-pore size porous periclase-forsterite ceramic material prepared in this example: the apparent porosity is 40-51%; the bulk density is 1.61-1.92 g/cm3(ii) a The average pore diameter is 500-1200 nm; the compressive strength is 50-80 MPa; the phase composition is periclase and forsterite.
Example 2
A porous periclase-forsterite ceramic material with nanometer pore diameter and its preparation method are provided. The preparation method of the embodiment comprises the following steps:
firstly, heating magnesite fine powder to 600-800 ℃ at the speed of 1-2 ℃/min, and preserving heat for 2-3 hours; and then heating to 1000-1200 ℃ at the speed of 2-3 ℃/min, preserving the heat for 1-3 hours, and cooling to obtain the magnesium oxide powder with high porosity.
And secondly, putting the high-porosity magnesium oxide powder into a vacuum stirrer, vacuumizing to below 1.5kPa, pouring the silica sol and the silica micropowder into the vacuum stirrer, stirring for 15-30 minutes, and closing a vacuumizing system to obtain a mixture according to 73-83 wt% of the high-porosity magnesium oxide powder, 7-15 wt% of silica sol and 4-13 wt% of the silica micropowder.
Step three, heating the mixture to 110-220 ℃, preserving heat for 2-5 hours, cooling, and performing mechanical compression molding under the condition of 60-80 MPa; drying the molded blank at 110-150 ℃ for 16-28 hours; then heating to 1000-1200 ℃ at the speed of 2-3 ℃/min, and preserving heat for 1-3 hours; and then heating to 1400-1500 ℃ at the speed of 4-5 ℃/min, preserving the heat for 4-7 hours, and cooling to obtain the nano-aperture porous periclase-forsterite ceramic material.
The particle size of the magnesite fine powder is less than 0.044 mm; the particle size of the aluminum hydroxide micro powder is less than 0.002 mm.
The nano-pore size porous periclase-forsterite ceramic material prepared in this example: the apparent porosity is 35-45%; the bulk density is 1.78-2.06 g/cm3(ii) a The average pore diameter is 900-1500 nm; the compressive strength is 70-100 MPa; the phase composition is periclase and forsterite.
Example 3
A porous periclase-forsterite ceramic material with nanometer pore diameter and its preparation method are provided. The preparation method of the embodiment comprises the following steps:
firstly, heating magnesite fine powder to 600-800 ℃ at the speed of 1-2 ℃/min, and preserving heat for 2-4 hours; and then heating to 800-1000 ℃ at the speed of 2-3 ℃/min, preserving the heat for 3-5 hours, and cooling to obtain the magnesium oxide powder with high porosity.
And secondly, putting the high-porosity magnesium oxide powder into a vacuum stirrer, vacuumizing to below 0.5kPa, pouring the silica sol and the silica micropowder into the vacuum stirrer, stirring for 15-30 minutes, and closing a vacuumizing system to obtain a mixture according to 78-88 wt% of the high-porosity magnesium oxide powder, 2-10 wt% of silica sol and 3-12 wt% of the silica micropowder.
Step three, heating the mixture to 110-220 ℃, preserving heat for 2-5 hours, cooling, and performing mechanical compression molding under the condition of 70-90 MPa; drying the molded blank at 110-150 ℃ for 20-32 hours; then heating to 800-1000 ℃ at the speed of 2-3 ℃/min, and preserving heat for 3-5 hours; and then heating to 1500-1600 ℃ at the speed of 3-4 ℃/min, preserving the heat for 5-8 hours, and cooling to obtain the porous periclase-forsterite ceramic material with the nano pore diameter.
The particle size of the magnesite fine powder is 0.022-0.074 mm; the particle size of the silicon dioxide micro powder is less than 0.001 mm.
The nano-pore size porous periclase-forsterite ceramic material prepared in this example: the apparent porosity is 30-40%; the bulk density is 1.92-2.19 g/cm3(ii) a The average pore diameter is 700-1200 nm; the compressive strength is 80-120 MPa; the phase composition is periclase and forsterite.
Example 4
A porous periclase-forsterite ceramic material with nanometer pore diameter and its preparation method are provided. The preparation method of the embodiment comprises the following steps:
firstly, heating magnesite fine powder to 600-800 ℃ at the speed of 1-2 ℃/min, and preserving heat for 3-4 hours; and then heating to 1000-1200 ℃ at the speed of 2-3 ℃/min, preserving the heat for 3-5 hours, and cooling to obtain the magnesium oxide powder with high porosity.
And secondly, according to 85-95 wt% of the high-porosity magnesium oxide powder, 0.1-9 wt% of silica sol and 0.1-8 wt% of silica micropowder, putting the high-porosity magnesium oxide powder into a vacuum stirrer, vacuumizing to below 1.0kPa, pouring the silica sol and the silica micropowder into the vacuum stirrer, stirring for 15-30 minutes, and closing a vacuumizing system to obtain a mixture.
Step three, heating the mixture to 110-220 ℃, preserving heat for 2-5 hours, cooling, and performing mechanical compression molding under the condition of 80-100 MPa; drying the molded blank for 24-36 hours at the temperature of 110-150 ℃; then heating to 1000-1200 ℃ at the speed of 2-3 ℃/min, and preserving heat for 3-5 hours; and then heating to 1500-1600 ℃ at the speed of 3-4 ℃/min, preserving the heat for 4-8 hours, and cooling to obtain the porous periclase-forsterite ceramic material with the nano pore diameter.
The particle size of the magnesite fine powder is less than 0.074 mm; the particle size of the silicon dioxide micro powder is less than 0.001 mm.
The nano-pore size porous periclase-forsterite ceramic material prepared in this example: the apparent porosity is 25-35%; the bulk density is 2.06-2.30 g/cm3(ii) a The average pore diameter is 500-1000 nm; the compressive strength is 100-150 MPa; the phase composition is periclase and forsterite.
Compared with the prior art, the specific implementation mode has the following positive effects:
according to the specific embodiment, the magnesite fine powder is decomposed in situ at 600-800 ℃ to generate nano-scale air holes, the formed magnesium oxide microcrystals are subjected to surface diffusion and evaporation-condensation substance transmission processes at 800-1200 ℃, certain neck links are generated among the magnesium oxide microcrystals, particle rearrangement in the middle and later sintering stages is limited, magnesium oxide powder with high porosity is obtained, and the porous periclase-forsterite ceramic material with the nano-pore diameter, small volume density and low heat conductivity coefficient can be obtained by taking the magnesium oxide powder as a raw material.
The specific implementation mode introduces silica sol into the magnesium oxide powder with high porosity, and leads SiO in the silica sol to be in vacuum2The magnesium oxide is enriched at the neck of the particle, and the forsterite neck is generated through in-situ reaction at high temperature, so that rearrangement of the magnesium oxide particle in the high-temperature sintering process is hindered.
In the specific embodiment, the silica micro powder is added into the magnesia powder with high porosity to fill the gaps among the magnesia powder, so that on one hand, pores among the magnesia powder can be subjected to nanocrystallization, the strength of the product is improved, and on the other hand, the magnesia powder is connected with the forsterite neck formed by in-situ reaction of the magnesia to prevent the rearrangement of the magnesia particles in the high-temperature sintering process, thereby obtaining the porous periclase-forsterite ceramic material with nano pore diameter.
The detection of the porous periclase-forsterite ceramic material with the nano pore diameter prepared by the specific embodiment is as follows: the apparent porosity is 25-51%; the bulk density is 1.61-2.30 g/cm3(ii) a The average pore diameter is 500 nm-1500 nm; the compressive strength is 50-150 MPa; the phase composition is periclase and forsterite.
Therefore, the preparation cost of the embodiment is low, and the prepared nano-aperture porous periclase-forsterite ceramic material has the characteristics of nano-scale aperture, small volume density, low thermal conductivity and high strength.
Claims (5)
1. A preparation method of a porous periclase-forsterite ceramic material with nano-pore diameter is characterized by comprising the following steps:
firstly, heating magnesite fine powder to 600-800 ℃ at the speed of 1-2 ℃/min, and preserving heat for 1-4 hours; heating to 800-1200 ℃ at the speed of 2-3 ℃/min, preserving the heat for 1-5 hours, and cooling to obtain magnesium oxide powder with high porosity;
secondly, according to the weight percentages of 65-95% of the high-porosity magnesium oxide powder, 0.1-18% of silica sol and 0.1-22% of silica micropowder, firstly placing the high-porosity magnesium oxide powder in a vacuum mixer, vacuumizing to below 2.0kPa, then pouring the silica sol and the silica micropowder into the vacuum mixer, mixing for 15-30 minutes, and closing a vacuumizing system to obtain a mixture;
step three, heating the mixture to 110-220 ℃, preserving heat for 2-5 hours, cooling, and performing mechanical compression molding under the condition of 30-100 MPa; drying the molded blank at 110-150 ℃ for 12-36 hours; then heating to 800-1200 ℃ at the speed of 2-3 ℃/min, and preserving heat for 1-5 hours; and then heating to 1400-1600 ℃ at the speed of 3-5 ℃/min, preserving the heat for 3-8 hours, and cooling to obtain the porous periclase-forsterite ceramic material with the nano pore diameter.
2. The method for preparing a nanoporous periclase-forsterite ceramic material as claimed in claim 1, wherein the magnesite fine powder has a particle size of less than 0.088mm and a MgO content of 42-50 wt%.
3. Process for the preparation of nanoporous porous periclase-forsterite ceramic material as claimed in claim 1, characterized in that the SiO of the silica sol is2The content is 30-40 wt%.
4. The method for preparing a nanoporous porous periclase-forsterite ceramic material as claimed in claim 1, wherein the fine silica powder has a particle size of less than 0.002mm and SiO is a SiO powder2The content is more than 96 wt%.
5. A nanoporous porous periclase-forsterite ceramic material, characterized in that the nanoporous porous periclase-forsterite ceramic material is a nanoporous porous periclase-forsterite ceramic material prepared by the method of preparing a nanoporous porous periclase-forsterite ceramic material according to any one of claims 1 to 4.
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| CN113402286B (en) * | 2021-07-21 | 2022-06-03 | 东北大学 | High-density periclase-forsterite composite refractory ceramic and preparation method thereof |
| CN116675555A (en) * | 2023-05-24 | 2023-09-01 | 武汉理工大学 | Diatomite-based hierarchical porous heat-insulating ceramic and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103804002A (en) * | 2014-02-21 | 2014-05-21 | 武汉科技大学 | Light corundum-mullite refractory brick and preparation method thereof |
| CN103864434A (en) * | 2014-02-21 | 2014-06-18 | 武汉科技大学 | Lightweight periclase-magnesium aluminate spinel refractory material for rotary cement kiln and preparation method thereof |
| CN104086206A (en) * | 2014-07-28 | 2014-10-08 | 武汉科技大学 | Porous periclase-forsterite-spinel composite ceramic material and preparation method thereof |
| CN104140246A (en) * | 2014-07-28 | 2014-11-12 | 武汉科技大学 | Porous forsterite and akermanite composite ceramic material and preparation method thereof |
| CN106431435A (en) * | 2016-09-22 | 2017-02-22 | 郑州大学 | Porous periclase-forsterite multiphase material and preparation method thereof |
-
2017
- 2017-07-28 CN CN201710633569.5A patent/CN107445594B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103804002A (en) * | 2014-02-21 | 2014-05-21 | 武汉科技大学 | Light corundum-mullite refractory brick and preparation method thereof |
| CN103864434A (en) * | 2014-02-21 | 2014-06-18 | 武汉科技大学 | Lightweight periclase-magnesium aluminate spinel refractory material for rotary cement kiln and preparation method thereof |
| CN104086206A (en) * | 2014-07-28 | 2014-10-08 | 武汉科技大学 | Porous periclase-forsterite-spinel composite ceramic material and preparation method thereof |
| CN104140246A (en) * | 2014-07-28 | 2014-11-12 | 武汉科技大学 | Porous forsterite and akermanite composite ceramic material and preparation method thereof |
| CN106431435A (en) * | 2016-09-22 | 2017-02-22 | 郑州大学 | Porous periclase-forsterite multiphase material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 影响菱镁矿煅烧氧化镁粉活性的因素;崔崇等;《武汉工业大学学报》;19930930;第15卷(第3期);全文 * |
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